Ключевые слова: background, building, concrete, construction, energy, engineering, equipment, factory, fire, flash, ground, helmet, industrial, industry, iron, job, labor, laborer, light, machine, male, man, manufacture, manufacturing, mask, medicine, metal, people, person, production, protection, safety, site, skill, skilled, spark, steel, structure, technical, tool, transportation, welder, welding, work, worker, workers, workshop,